215 research outputs found
Hopping between Random Locations: Spectrum and Instanton
Euclidean random matrices appear in a broad class of physical problems
involving disorder. The problem of determining their spectra can be mapped,
using the replica method, into the study of a scalar field theory with an
interaction of the type e^(psi^2). We apply the instanton method to study their
spectral tails.Comment: 9 pages, Revtex, 2 postscript figure
Ferromagnetic resonance study of sputtered Co|Ni multilayers
We report on room temperature ferromagnetic resonance (FMR) studies of [
Co Ni]N sputtered films, where nm. Two
series of films were investigated: films with same number of CoNi bilayer
repeats (N=12), and samples in which the overall magnetic layer thickness is
kept constant at 3.6 nm (N=1.2/). The FMR measurements were conducted with a
high frequency broadband coplanar waveguide up to 50 GHz using a flip-chip
method. The resonance field and the full width at half maximum were measured as
a function of frequency for the field in-plane and field normal to the plane,
and as a function of angle to the plane for several frequencies. For both sets
of films, we find evidence for the presence of first and second order
anisotropy constants, and . The anisotropy constants are strongly
dependent on the thickness , and to a lesser extent on the total thickness
of the magnetic multilayer. The Land\'e g-factor increases with decreasing
and is practically independent of the multilayer thickness. The magnetic
damping parameter , estimated from the linear dependence of the
linewidth, , on frequency, in the field in-plane geometry,
increases with decreasing . This behaviour is attributed to an enhancement
of spin-orbit interactions with decreasing and in thinner films, to a
spin-pumping contribution to the damping.Comment: 18 pages, 13 figure
Solar neutrino-electron scattering as background limitation for double beta decay
The background on double beta decay searches due to elastic electron
scattering of solar neutrinos of all double beta emitters with Q-value larger
than 2 MeV is calculated, taking into account survival probability and flux
uncertainties of solar neutrinos. This work determines the background level to
be [1-2]E-7 counts /keV/kg/yr, depending on the precise Q-value of the double
beta emitter. It is also shown that the background level increases dramatically
if going to lower Q-values. Furthermore, studies are done for various detector
systems under consideration for next generation experiments. It was found that
experiments based on loaded liquid scintillator have to expect a higher
background. Within the given nuclear matrix element uncertainties any approach
exploring the normal hierarchy has to face this irreducible background, which
is a limitation on the minimal achievable background for purely calorimetric
approaches. Large scale liquid scintillator experiments might encounter this
problem already while exploring the inverted hierarchy. Potential caveats by
using more sophisticated experimental setups are also discussed
Wolves in the Wolds: Late Capitalism, the English Eerie, and the Wyrd Case of ‘Old Stinker’ the Hull Werewolf
In this article, I depart from the earlier opinions of Emily Gerard, Sabine Baring-Gould, and others, who explained the disappearance of the werewolf in folklore as following the extinction of the wolf. I argue instead that British literature is distinctive in representing a history of werewolf sightings in places in Britain where there were once wolves. I draw on the idea of absence, manifestations of the English eerie, and the turbulence of England in the era of late capitalism to illuminate my analysis of the representation of contemporary werewolf sightingsPeer reviewe
Quantifying annual spatial consistency in chick-rearing seabirds to inform important site identification
Animal tracking has afforded insights into patterns of space use in numerous species and thereby informed area-based conservation planning. A crucial consideration when estimating spatial distributions from tracking data is whether the sample of tracked animals is representative of the wider population. However, it may also be important to track animals in multiple years to capture changes in distribution in response to varying environmental conditions. Using GPS-tracking data from 23 seabird species, we assessed the importance of multi-year sampling for identifying important sites for conservation during the chick-rearing period, when seabirds are most spatially constrained. We found a high degree of spatial overlap among distributions from different years in most species. Multi-year sampling often captured a significantly higher portion of reference distributions (based on all data for a population) than sampling in a single year. However, we estimated that data from a single year would on average miss only 5 % less of the full distribution of a population compared to equal-sized samples collected across three years (min: −0.3 %, max: 17.7 %, n = 23). Our results suggest a key consideration for identifying important sites from tracking data is whether enough individuals were tracked to provide a representative estimate of the population distribution during the sampling period, rather than that tracking necessarily take place in multiple years. By providing an unprecedented multi-species perspective on annual spatial consistency, this work has relevance for the application of tracking data to informing the conservation of seabirds
Priorities for synthesis research in ecology and environmental science
ACKNOWLEDGMENTS We thank the National Science Foundation grant #1940692 for financial support for this workshop, and the National Center for Ecological Analysis and Synthesis (NCEAS) and its staff for logistical support.Peer reviewedPublisher PD
Priorities for synthesis research in ecology and environmental science
ACKNOWLEDGMENTS We thank the National Science Foundation grant #1940692 for financial support for this workshop, and the National Center for Ecological Analysis and Synthesis (NCEAS) and its staff for logistical support.Peer reviewedPublisher PD
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